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Control of Dampers ®® INDEX I. INTRODUCTION A. Economizer Systems ............................................................................................................ 3 B. Indoor Air Quality ...................................................................................................................3 C. Damper Selection ..................................................................................................................3 II. DAMPER SELECTION A. Opposed and Parallel Blade Dampers ..................................................................................3 B. Flow Characteristics...............................................................................................................4 C. Damper Authority ..................................................................................................................4 D. Combined Flow ......................................................................................................................6 III. ADDITIONAL CONSIDERATIONS A. Economizer Systems .............................................................................................................6 B. Building Pressure ...................................................................................................................8 C. Mixed Air Temperature Control ..............................................................................................8 D. Actuators - General ................................................................................................................8 E. Hysteresis ..............................................................................................................................9 F. Accuracy ...............................................................................................................................9 G. Actuators - Pneumatic..........................................................................................................10 H. Positioners ...........................................................................................................................11 I. Torque..................................................................................................................................11 J. Linkage.................................................................................................................................11 K. Actuators - Electronic ...........................................................................................................12 L. Electronic Actuators - Conventional Crank Arm Type..........................................................12 M. Electronic Actuators - Direct Coupled ..................................................................................13 IV. OPTIMIZING ECONOMIZER SYSTEMS A. Sizing of Dampers ...............................................................................................................14 B. Linearization.........................................................................................................................15 C. Range Controller ..................................................................................................................15 D. Choice of Dampers ..............................................................................................................16 V. ADVANTAGES A. Direct Coupled Actuators .....................................................................................................17 B. Range Controller ..................................................................................................................17 VI. MODERNIZATION OF OLD INSTALLATIONS .............................................................................................................................................17 VII. SUMMARY .............................................................................................................................................17 REFERENCES Air Movement and Control Association, Inc. (AMCA) Publication 502-89 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE) 1991 Applications Handbook, sec. 41.6 We would like to thank Bengt Carlson, Energy Management Consultant, the primary contributor to this book, along with Larry Felker, Area Sales Manager, and Robert Balkun, Product Manager, for their efforts in creating this Application Guide. If you have any comments on the information given or possible additions, please send them to Robert Balkun, Product Manager, Belimo Aircontrols (USA), Inc., P.O. Box 2928, Danbury, CT 06813, (800) 543-9038, in CT (203) 791-9915, FAX (203) 791-9919. The ideas and concepts shown in this book are based on standard, HVAC engineering guide lines. The use of the information given must be used with sound engineering judgement. Belimo Aircontrols does not take responsibility for problems caused by the concepts given in this publication. All the contents of this publication are the sole property of Belimo Aircontrols (USA), Inc. and may not be reproduced without the written authorization of Belimo Aircontrols (USA), Inc. © 1995 Belimo Aircontrols (USA), Inc. 2 ® Damper Applications Guide 1 I. INTRODUCTION I-A. Economizer Systems FAN The economizer portion of an air- EA RA handling system is not only respon- sible for reducing the operating cost of the system, but more importantly, it has to provide a sufficient volume ACTUATORS RA of outside air at all times to ensure good indoor air quality. The func- FAN tion of the economizer also affects Heating/Cooling the pressurization of the building. A OA Etc. SA slight positive pressure is needed to prevent infiltration of unconditioned outside air. Otherwise the indoor climate can be adversely affected due to draft and cold perimeter Fig. 1 - Economizer System walls. This is typically compensated for by increasing the room temperature, which increases the operating cost. However, too high pres- sure causes exfiltration, which increases the heat losses. Also, an incorrect pressurization may cause damages to the building structure due to condensation, freezing etc. See Fig. 1. I-B. Indoor Air Quality The indoor air quality and comfort is much more important than the operating cost of the air handling system. If it is not adequate, absenteeism and turnover will increase and productivity will suffer. This is a hidden cost, which is hard to quantify, but nevertheless, it is a very large cost that can seriously affect the bottom line of any organization. Just imagine what the cost of a few percent decrease in the productivity can be. While the cost of air conditioning typically is $2/sq. ft., the cost of productive workers is $150/sq. ft. The ventilation system is the cause of almost half the indoor air quality complaints according to NIOSH (National Institute of Occupational Safety and Health). Damper control alone is itself not responsible for the indoor air quality and climate, but it has a very central role. Therefore, it is important that the dampers and actuators are selected, sized and operated correctly. I-C. Damper Selection Traditionally, little attention is given to the selection of the dampers that comprise the economizer. What is even worse is that the selection of the actuators that operate the dampers is based upon one criterion only, and that is that they provide sufficient torque to operate the dampers. The accuracy of the control is rarely considered. Without accurate damper positioning, the economizer will not function correctly, and both the indoor air quality and comfort is compromised. The following text discusses the importance of selecting and sizing the dampers for correct operation. II. DAMPER SELECTION II-A. Opposed and Parallel Blade Dampers. In HVAC installations two different types of rectangular dampers are used to modulate air flow. These are parallel and opposed blade dampers. Parallel blade dampers are con- structed so all the blades move in the same direction and in parallel. See Fig 2. PARALLEL BLADE OPPOSED BLADE Opposed blade dampers are con- DAMPER DAMPER structed so blades next to each other move in opposite directions. See Fig. 3. Fig. 2 Fig. 3 3 Damper Applications Guide 1 ® II B. Flow Characteristics NOTE: NOTE: The characteristics will be different when installed The characteristics will be different when installed The two types of dampers have dif- in a system. See Fig. 6. in a system. See Fig. 7. ferent “inherent flow characteristics”. FLOW FLOW This can be illustrated by a curve % % that shows the relationship between 100 100 the flow rate and the position of the 90 90 blades. 80 80 70 70 Fig. 4 shows the inherent flow char- 60 60 acteristics for both parallel and opposed 50 50 blade dampers. Notice that neither 40 40 damper has a linear characteristic. 30 30 20 20 Opposed blade dampers give a very 10 10 slow increase in the flow when the damper begins to open. 0 0 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 50 60 70 80 90 °POSITION °POSITION Parallel blade dampers have an inher- ent curve that is not as pronounced, PARALLEL BLADE DAMPER OPPOSED BLADE DAMPER so the flow increases more rapidly when the damper begins to open. Fig. 4 - Inherent Characteristics of a Parallel and Opposed Blade Dampers It is very important to realize that the inherent curves are measured under laboratory conditions, with a constant CLOSED DAMPER differential pressure across the damper. (In a real installation the F curves will be distorted. See Fig. 6 I C C and 7.) L O O NO FLOW T I I E L L R II-C. Damper Authority
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